AD8630ARZ

Overview

The AD8630ARZ is a quad zero-drift operational amplifier manufactured by Analog Devices Inc. It features rail-to-rail input and output swing, operating on a single supply from 2.7 V to 5 V or dual supplies of ±1.35 V to ±2.5 V. Key electrical parameters include a typical offset voltage of 1 µV, maximum input bias current of 300 pA, gain bandwidth product of 2.5 MHz, and slew rate of 1 V/µs. The device offers high common-mode rejection ratio (CMRR) and power supply rejection ratio (PSRR) at 140 dB and 130 dB respectively. It operates within an extended industrial temperature range of -40°C to +125°C and is housed in a 14-lead SOIC package.

Feature Summary

• Utilizes patented auto-zeroing and chopping topology to achieve ultralow offset voltage and drift without external components.
• Provides rail-to-rail input and output swing capability for maximizing signal-to-noise ratio and reducing input bias complexity.
• Features extremely low input bias current and eliminates 1/f noise internally to ensure high precision in DC-coupled measurements.
• Delivers fast overload recovery time due to internal settling occurring within two clock cycles after output saturation.

Applications

• Automotive sensors
• Pressure and position sensors
• Strain gage amplifiers
• Medical instrumentation
• Precision current sensing

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and packing quantity. Ensure the component meets RoHS compliance requirements if applicable to your design specifications. Confirm that the automotive grade variants are distinct from commercial models if used in automotive applications.

Selection Notes

Select this component when designing systems requiring high DC precision with minimal offset error over wide temperature ranges. The quad configuration allows multiple channels in a single package, suitable for multi-sensor interfaces. Consider the rail-to-rail performance for low-voltage single-supply applications where maximizing dynamic range is critical.

Part Context

The AD8630ARZ belongs to the AD8628/AD8629/AD8630 family of zero-drift amplifiers. While the AD8628 is a single-channel device and the AD8629 is dual-channel, the AD8630 integrates four independent amplifiers. All members share the same core technology, offering low noise, high accuracy, and no requirement for external capacitors for stabilization.

Replacement Considerations

Public confirmed substitute part numbers: MS8630T.

FAQ

Does the AD8630 require external capacitors for stability?

No, the AD8630 does not require external capacitors for operation.

What is the mechanism behind the low noise performance of the AD8630?

It uses a patented ping-pong arrangement combining auto-zeroing and chopping to minimize both low-frequency noise and noise energy at switching frequencies.